[经验]

如何对基于Numaker-IoT-M487开发板的SD卡进行功能验证呢

2022-7-5 15:41:52

4040 SD卡 RT-Thread 读卡器 USB接口

简介
本文主要介绍基于Numaker-IoT-M487开发板的SD卡功能验证，由于为初次使用RT-Thread系统，摸索了一下使用，感觉还是挺容易上手的系统，鉴于理解有限，后文中如有理解错误之处，还请大佬指出，在此先谢谢了，闲言少续，直奔主题。

环境搭建
验证所需硬件环境：

Numaker-IoT-M487开发板

Micro-USB线

SD卡

读卡器
验证使用软件环境

RT-Thread Studio IDE

RT-Thread OS version 4.0.4

Numaker-IoT-M487 SDK库version 1.0.0

硬件接线如下图

2、硬件对应原理图接口如下图

验证流程介绍

RT-Thread Studio软件环境搭建、板载SDK包下载以及搭建基础test工程方法这里就不单独介绍了

SD卡系统驱动验证配置
双击工程中RT-Thread Settings进入RT-Thread系统配置界面，依次设置如下

void SD_RD_Test()
{
#define Data_Size (30*1024)
static uint8_t data_buff[Data_Size]="hello world!";
uint32_t t1=0;
uint32_t t2=0;
uint32_t t=0;
int fd = open("/test.txt",O_WRONLY|O_CREAT);
if (fd<0)
{
rt_kprintf("open fail\n");
return ;
}
t1=rt_tick_get();
write(fd, data_buff, Data_Size);
t2=rt_tick_get();
t=t2-t1;
rt_kprintf("write SD time:%d ms\n",t);
close(fd);
rt_kprintf("write sucess\n");
rt_thread_mdelay(500);
fd = open("/test.txt",O_RDONLY);
if (fd<0)
{
rt_kprintf("open fail\n");
return ;
}
memset(data_buff,0,Data_Size);
t1=rt_tick_get();
read(fd, data_buff, Data_Size);
t2=rt_tick_get();
t=t2-t1;
rt_kprintf("read SD time:%d ms\n",t);
close(fd);
rt_kputs(data_buff);
}

`
int main(int argc, char **argv)
{

if defined(RT_USING_PIN)
int counter = 0;

/ set LEDR1 pin mode to output /
rt_pin_mode(LEDR, PIN_MODE_OUTPUT);
rt_pin_mode(LEDG, PIN_MODE_OUTPUT);
rt_pin_mode(LEDY, PIN_MODE_OUTPUT);

while (counter < 1)
{
rt_pin_write(LEDR, PIN_HIGH);
rt_pin_write(LEDG, PIN_LOW);
rt_pin_write(LEDY, PIN_HIGH);
rt_thread_mdelay(500);
rt_pin_write(LEDR, PIN_LOW);
rt_pin_write(LEDG, PIN_HIGH);
rt_pin_write(LEDY, PIN_LOW);
rt_thread_mdelay(500);
//rt_kprintf("Led process\n");
SD_RD_Test();
}
endif
return 0;
}
添加完成，编译下载至MCU中，查看运行效果
验证效果展示